public static void LISTDIRECTORY(TCPClient requester, string dir)
        {
            DirectoryInfo dirinfo;

            if (dir.Length != 2)
            {
                dirinfo = new DirectoryInfo(dir);
            }
            else
            {
                dirinfo = new DirectoryInfo(dir + "\\");
            }
            FileInfo[]      files  = null;
            DirectoryInfo[] dirs   = null;
            List <string>   dnames = new List <string>();

            try
            {
                files = dirinfo.GetFiles();
                dirs  = dirinfo.GetDirectories();
            }
            catch
            {
                Log($"Access to directory '" + dir + "' was denied!", Color.Red);
                var pkg = new TcpPackage("ACCESS DENIED");
                Log($"Begin send command response to client {{Host: {requester.Ip} Port: {requester.Port}}} - Length: {pkg.Size} byte(s)", Color.FromArgb(0x0072ff));
                requester.SendPackage(pkg);
                Log($"Sent package to client {{Host: {requester.Ip} Port: {requester.Port}}} - Pacakge of System.byte[{pkg.Size}]", Color.Cyan);
                console.Log("");
                return;
            }
            string data = "Files:";

            if (new DirectoryInfo(dir).Parent != null && dir.Length != 2)
            {
                dnames.Add("..");
            }
            foreach (var d in dirs)
            {
                if (!Encoding.ASCII.GetString(Encoding.ASCII.GetBytes(d.Name)).Contains("?"))
                {
                    dnames.Add(d.Name);
                }
            }
            for (int i = 0; i < files.Length; i++)
            {
                data += "\n\t" + files[i].Name + ";";
            }
            data += "\nDirectories:";
            for (int i = 0; i < dnames.Count; i++)
            {
                data += "\n\t" + dnames[i] + ";";
            }
            var package = new TcpPackage(data);

            Log($"Begin send command response to client {{Host: {requester.Ip} Port: {requester.Port}}} - Length: {package.Size} byte(s)", Color.FromArgb(0x0072ff));
            requester.SendPackage(package);
            Log($"Sent package to client {{Host: {requester.Ip} Port: {requester.Port}}} - Pacakge of System.byte[{package.Size}]", Color.Cyan);
            console.Log("");
        }